The following 10mm performance is what I don't believe. Not for a G29.

OK, I thought you weren't believing Double Tap's claim of 200grn at 1100fps from a G29. I don't believe that Buffalo Bore is getting 220grn at 1200fps from a G29 either, and neither does Buffalo Bore. Their 1200fps velocity claim is from a 5" 1911 barrel according to their website. I'd expect something more like 1100fps from a G29.